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The reverse taper design features an extended flute that penetrates thicker materials while guiding chips away from the surface, eliminating clogging and reducing burn-out and waste.Ultra-Z fasteners come in a full range of sizes and drives and are available with corrosion inhibiting OxySeal II coating for extended life. Ultra-Z drilling fasteners are manufactured using an innovative tapered compression point process (TCP) with tightened tolerance controls to provide an ultra-sharp cutting edge. Proudly manufactured in the USA. Please allow additional 2-3 days for paint and curing time.